CentOS Linux: Find Memory (RAM) Usage Information Command

To find memory (RAM) usage information on CentOS Linux, you can use the free command or the vmstat command.

1. To display the amount of free and used memory on the system, you can use the free command. The free command displays the total amount of physical and swap memory on the system, as well as the amount of memory that is used, free, and available.

For example:

free -h

This will display the amount of memory in human-readable format (e.g., KB, MB, GB).

2. To display more detailed information about memory usage, you can use the vmstat command. The vmstat command displays statistics about memory, CPU, I/O, and other system resources.

For example:

vmstat -s

This will display the total amount of memory on the system, as well as the amount of memory that is used, free, and available.

You can also use the vmstat command with the -m option to display information about memory usage by kernel modules:

vmstat -m

This will display the amount of memory used by each kernel module on the system.

It's a good idea to monitor your system's memory usage to ensure that you have enough memory available for your applications and processes. If your system is running low on memory, you may experience performance issues or system instability. You can use the free or vmstat command to help diagnose and troubleshoot memory issues on your system.